A. Carlosena et Gs. Moschytz, DESIGN OF VARIABLE-GAIN CURRENT CONVEYORS, IEEE transactions on circuits and systems. 1, Fundamental theory andapplications, 41(1), 1994, pp. 79-81
Several possible implementations of variable-gain current conveyors ar
e proposed. They can be designed with two opamps and current mirrors a
nd exhibit constant bandwidth property. Their configuration as differe
ntial-output current amplifiers is straightforward.